16767406421 has 4 divisors (see below), whose sum is σ = 16879939500. Its totient is φ = 16654873344.

The previous prime is 16767406417. The next prime is 16767406471. The reversal of 16767406421 is 12460476761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12460476761 = 1033 ⋅12062417.

It can be written as a sum of positive squares in 2 ways, for example, as 5342148100 + 11425258321 = 73090^2 + 106889^2 .

It is a cyclic number.

It is not a de Polignac number, because 16767406421 - 2² = 16767406417 is a prime.

It is a super-2 number, since 2×16767406421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16767406471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56266316 + ... + 56266613.

It is an arithmetic number, because the mean of its divisors is an integer number (4219984875).

Almost surely, 2^16767406421 is an apocalyptic number.

It is an amenable number.

16767406421 is a deficient number, since it is larger than the sum of its proper divisors (112533079).

16767406421 is a wasteful number, since it uses less digits than its factorization.

16767406421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112533078.

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 16767406421 in words is "sixteen billion, seven hundred sixty-seven million, four hundred six thousand, four hundred twenty-one".